a. The movable unit, consisting of sheaves, frame, clevis, and/or hook,
connected to, and hoisted or lowered with, the load in a block-and-tackle
system. Also called floating block; running block. Long
b. The pulley block that hangs below the crown block and is used for
lifting the drilling column. BS, 9
c. A frame for a sheave or a set of sheaves that slides in a track.
Syn:traveling sheave
The section of a mine shaft used for raising and lowering miners.
Stoces
A movable gantry built on wheels for traveling on rails and supporting a
hoisting device. Hammond
A roadway used by miners for walking to and from the face; i.e., from the
shaft bottom or main entry to the workings and back. Syn:traveling way
Nelson
A sheave block that slides in a track. See also:traveling block
Nichols, 1
See:traveling road
The portion of the overlying strata at the coal face that is supported and
controlled by face supports. This weight "advances" as the face line moves
forward. See also:underweight
a. A sequence or system of measured lengths and directions of straight
lines connecting a series of surveyed points (or stations) on the Earth's
surface, obtained by or from field measurements, and used in determining
the relative positions of the points (or stations). AGI
b. A line surveyed across a plot of ground. AGI
c. To make a traverse; to carry out a traverse survey.
See also:traverse survey
d. A vein or fissure in a rock, running obliquely and in a transverse
direction. AGI
e. A line across a thin section or other sample along which grains of
various minerals are counted or measured. AGI
A platform superimposed upon or forming part of the rail track that is
free to roll or slide sideways so that a car can be moved bodily from one
track to another parallel to it. See also:inclined traverser
Nelson
The basic idea of this system is to confine the mine-car circuit to the
smallest possible compass near the mine shaft. This avoids locking up cars
on the surface that are better employed underground and reduces labor
requirements. In this system, instead of the use of shunt backs on car
circuits, the direction of car travel is changed by running onto a
portable platform that then moves the car bodily in a transverse
direction. The system can be applied, in conjunction with the necessary
lifts, to multideck cages. This system may be operated electrically,
hydraulically, or pneumatically. Sinclair, 5
A survey in which a series of lines joined end to end are completely
determined as to length and direction, these lines being often used as a
basis for triangulation. It is used esp. for long narrow strips of land
(such as for railroads) and for underground surveys. Syn:traverse
AGI
Published tables giving the differences of latitude and departure for
different angles. Hammond
One of three recognized methods for determining the average velocity of
airflow along a mine roadway by an anemometer. This is the general routine
procedure applied when measuring air velocities in mine roadways. While
the instrument is running, it is slowly and steadily moved up and down a
series of imagined vertical lines, so as to cover equal areas in equal
time. The total period is usually 1 min for a medium-sized roadway. The
integrated reading is then the mean velocity for that section.
CF:division method; single-spot method. Roberts, 1
a. A dense, finely crystalline, massive or concretionary limestone;
generally white, tan, or cream; commonly having a fibrous or concentric
structure and splintery fracture; formed by rapid chemical precipitation
of calcium carbonate from solution in surface and ground waters, such as
by agitation of stream water or by evaporation around the mouth or in the
conduit of a spring, esp. a hot spring. It also occurs in limestone caves,
where it forms stalactites, stalagmites, and other deposits; as a vein
filling; along faults; and in soil crusts. The spongy or less compact
variety is tufa. See also:cave onyx; onyx; onyx marble.
Syn:calcareous sinter; calc-sinter.
b. A term that has been applied to any cave deposit or calcium carbonate.
c. A term used inappropriately as a syn. of kankar.
d. Etymol. Italian tivertino from the old Roman name of Tivoli, a town
near Rome, where travertine forms an extensive deposit. Also spelled
travertin. Syn:travertine marble
See:travertine
A small truck or car conveying material about a furnace or iron mill;
sometimes applied to trucks, in mines, etc. See also:trolley
Fay
a. A car, carrier, or pallet, usually suspended from the moving element of
a conveyor.
b. A section of gravity conveyor, chain conveyor, or shaker conveyor.
See also:pan; trough. Syn:tray carrier
See:tray
A drying unit that differs from the ordinary round tank in that it houses
several horizontal trays that divide it into compartments. Each has its
own set of rakes and its own underflow for settled material and peripheral
overflow. Used where space is limited or in subarctic conditions that call
for antifreeze housing. Pryor, 3
a. The ground contact surface on a tire or a track shoe.
Nichols, 1
b. Occasionally, a high-friction lagging on a belt pulley.
Nichols, 1
c. The pit in which brickmakers soak their clay before putting it into the
pug mill. Standard, 2
A form of locomotive that is serviceable over rough roads. A trailer, with
capacity up to 16 yd3 (12.2 m3 ), with bottom discharge
or two-way side discharge is used with the tractor. The maximum speed is
about 6 m/h. Nelson